Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a14a8e0ac4296d8…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 19:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebc2f40c9166bb2042fd9127fb823b6a SHA-1: 9cc1c8ed00941a30094c3ca3cecd78cb4ec3cfb7 SHA-256: 2a14a8e0ac4296d860336b54fd8cecc75f64d6a6466650d6e481994a1af6857d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including one with a 'zombie age 3 hack download' UTM term, suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=zombie+age+3+hack+download PDF link annotation
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kibjv13jnhpjvievapu62pmsvk/42926982905.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/matofo.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210909033401.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/71225131129.pdfIn PDF document text
    • http://serting.eu/userfiles/files/lijemufijokulaviwakatoz.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/13401811638.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/79189815268.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/31231674248.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nepiwigavidigefamir.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nolotijisoraxufapigi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/18819284684.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2b95d97---27706257369.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa495a196---linokejivasezipigaxogem.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062a866156---48398643574.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ba26863fc---30143384304.pdfIn PDF document text
    • http://precisao.org/files/files/surejoxatoxarodusi.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xujira.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109021316454776.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87348285124.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/90306970625.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/depokagerufiviviji.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a98887e7---kaxopasi.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/niruvudivugem.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/sikifixupipapu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/nuxixebijo.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/52550115444.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 10904 bytes
SHA-256: ba9f3f14ab9b7b152991b428fd8177fdf07eab9eed992d197634fa59732b1295
font_01_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 16748 bytes
SHA-256: 395a6563ec336894ea95a64914887932abf1ec2009f72f9542c0a84951c5e0dc
font_02_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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